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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdc891798867180b74e944dd5844a80fd3245ad0ed9a80c85c926db09b38194' 
  AND token = 'Nh3E/u/NT51zacPrNFdib4/U8Cxg64goVK/6fs05jdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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