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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3a27228db32151b68eae6c9034d88e4772aa1bf1885d6320482f3407dfea4e' 
  AND token = 'LJkNdT/V//U4BXPyfU7qZJe1J8321JZbxkuMuwzm1lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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