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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efcd5f9437621912b2a85fc7500b6008a134bf9aea0c0133db71095cef9dea7c' 
  AND token = 'tgeezRxJazB3n8erXOuS9jh+k8pro3EfIqiV+KTWpHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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