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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2de12bdde20fd6bc63e4c611bc808448cca7200ceaf53a1ba4f8cf1e080fc3' 
  AND token = 'v87KVrRpQj0YLvINizBvz5vUurD8jUbdWGWoLsqi76w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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