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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce070953054f70faec1eebb651df7674747ec7f13c6f0a56bb0626988ead5378' 
  AND token = '6YQXfqy8MwqzHhhzvbjqyxGPCkg1pi3H8wef2Wxgqq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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