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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1184abafe36edc9612eb7319e68083c5283a4ff3f8ca5f2e60d0255fc7751d8a' 
  AND token = 'cAR9vHJI45gAHRFgMrkf5VmpQqiIuLlZwW57/d8TWX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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