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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094fd317940f27780c4f06adf290d31815ce1e21ce7e02b1bcfa2ba804cd490b' 
  AND token = 'tCgFMdig4mW+J6Yb8dndBlm5b/ysWuiakIchqC0OjtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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