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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e38a181ddecb6e498dbb71aeefed934f36accb52d38308a252ceb377a42a5a4' 
  AND token = 'tkoojM+ad0qXApiu/w3z1x2m7PgpSsZy3S4Sf650mv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}