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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29391b2d29a92a557c385e5f8e6facea091be6e11068cef62047d85f87152bbf' 
  AND token = 'rxlrK5thT/cnAUZQpTZ5jabmDL08D2E1vRuUr2gv4bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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