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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412b9aa67aeb7a4fb997626cbda1524c2bea54eb9de084428543c3cd1e32c8ee' 
  AND token = 'n2fjcckGGUjAYqqslD7KgHQ9Xeh8Ij6B6ih8F6fv92s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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