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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c445bcb404e4c254c19d23b9848915576dea41a0f7eec8a1a99954f808e91f' 
  AND token = 'fuTZdsJSzt8KBSFtLhcLgYQwNF6bLDaRYdtzYiPex6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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