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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba176460921e858a35ded922581e332b8e9467b7d75bbe9f1350499c1611b818' 
  AND token = '9W5j3Mph7OMoctYyymNf7fzmONfZlufYR5ST5JsaYdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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