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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14249483a0bb0c9008771722bd49d24329cc4762ad9ed10966f894b08929a990' 
  AND token = '1yt4xcBq6F3SARtepqLONZXBJRTJNYfKueTCSkM2kBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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