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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79303a986a47ceb2b50969ce3c044c877f9628f6bf42287d1e3e91d860b82cf0' 
  AND token = 'kj7P9EmjsN69Xkfwb3apbzX0tBOq69zDOKpPeqJcteQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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