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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae16722acda685a141756de4d2ff009afde0fb106bfd2c856f6c056e228a5d7' 
  AND token = 'q3wsIRzsWh1sBzozx0yV3nmuBQmj49/ROmQ0rQhH+Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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