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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20d885b1ae5212ac16984e48a8b336c9b7a7ab67d1c0054bf7ec30915712da7' 
  AND token = 'mEPiRP6qZqWgryYsIMDhDLtMQK82AIyqS3eKoSxvS/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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