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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8179ee48567057155cc3d98a3b0e9a39d6de97355196847511e2ae538cee75e8' 
  AND token = 'nyiqXD/5aqlBCsDnrttReyQ7gqpxlvpd5A27eo0qV/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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