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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa0f62bb3cc7e0a01c955f05e37019d45a8a89dee8c3e902e00f31df1e935b2' 
  AND token = 'fm+uJBvjkT4uhVZt6PyB2vLOdnNWo0fI2IRkT4ZtQRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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