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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69acde2b26273ec8e6dd30bb704e762d49c544a4e8ac63da5ca9c9ab135c4e3c' 
  AND token = 'dUe5VKwrPLH3mSfsl1w0Ri5m3iY++zByE8t38EefdSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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