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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57cfdcc9b9507a0135ab2669827eeaca3ba1f099a56a21b13b996e3924b3c1f3' 
  AND token = 'wP+01VkgOksx+sq71aOVTwM9igkZ4iZU4580TFA+Zu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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