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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9447fd7bacd3481e64169bb254e3570895b276d01f96a385b7e04b871761e9f6' 
  AND token = 'd8CFz8zsNfum1R4tUVUQT0jP3R+7QjBrxbeph8391IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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