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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df72b3f2de9ff8f54eba3bb4c47a1540dd7781579d56e9d506fca6b0d6ac9845' 
  AND token = 'Qw7f3AC3ab/ncvkmLaUZ8FUPEDAMB5FwH8BVyEkuZEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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