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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28b315b8c373512ab4040b39565d221df6f5816e9326d389a30ed23c4d36a2c' 
  AND token = 'M9OjcULnrrCpDJSOgnWSY6glS4TL7ff//Nnj9Du1D8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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