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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccf8348e2e19a26542be2751de6ce49c70dcc392818ae290cd9b181e8a29ecd' 
  AND token = 'uBP+46VTcb53icycwB7Pd0BBwLYY1CdNy62kzGpy7yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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