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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fca33a4221915812618fd755c7e50878770bc7bb691a52176f1ba2ea0b2b4a' 
  AND token = 'e2mGWMb5xNS4x9viQqtcsjTPvWaexZXklnpxkPBG8Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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