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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b0dde449a5138ba4669913df3a49c0d24633c380f64b586b90a748d6c13366' 
  AND token = 'LQxiHmU+bnjwMY/gvvW2waXS6vFFb8JIlNiDaEgvnFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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