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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69bcfaf005083f77ff7b77f0fba9622d0e41548b4965ce6ebd44165371fa1ad' 
  AND token = 'oxIWcoIbRu7xNh/H+3h18FO8/41HYZtpzpX/jS5qjMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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