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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bea9214a57636dc8a449aa11072295264962a25026a3790d8dae893c88c753' 
  AND token = 'dzdnCqiZwCQQbA5vbFclyU/tfnG3XDAFXMivAb8eB+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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