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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f38477c6c1ab8ade57c13f535728082613371c3e8f4356d5bd56a098fca2598' 
  AND token = '7IIJH2xNifCBpQtecJRrowIbARsjMzrdf6ZL4IkKeig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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