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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b2c6cf74d27d269a637add0bbe55e76fa13bcec6df58f1e3ea633f66ecc1fb' 
  AND token = 'VP5QpfUcaO+DEi1KY0trbhss4R6deZCWIQa7t9ISEa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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