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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd768709d47820f97093743c66e007b2b1525af446ad3bd00a232d71e0ac9608e' 
  AND token = 'VP5NDjxDLAPUHTToBRn6m+6HZSZzoAJABby1e1baRnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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