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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e4e3dc6e9725273a27ea26234cdcdd69f65ba9e0e880f0dd2cdae8920d4e5f' 
  AND token = '4grnaQe4z85ZGKL+bxNtLkYJJu8WEfhssgDuY5OjKYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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