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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19b612d6898697d3babf6db58543d2085543a49d6ec4f45e6d4307e930db18b' 
  AND token = 'HD3ij0xT5MezWU/j/JHu+2gNRxSv5AQadTr99I03dZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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