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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47354a645e39da1597b675df63e5722856b1e79e11b522057a4c26aeb5decb74' 
  AND token = 'q62kkk+ZYgx53LjdS1tXMDb9ezY9FeEGVosNjYsUa9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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