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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009a49251b8b68dcf5b2ada0b8e7412e04aaefcef245dd32ed5e91ff7b47e13a' 
  AND token = '6Gzl5uUpoCtjNfEwdfo81aeruE6Y1tDfq94Ujl7rwXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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