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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9b063471ba3877a8e758417c925d8ff7f610b4bde8eba8e6a9efc126521247' 
  AND token = 'yrsQ9KHNlwYyHe6M+M859XFAVXAqoWS5GYDoW69Wr0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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