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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2ea07a9ee95a455542e883224b1c5eb892a3f412f203e6e2a07826f8741af9' 
  AND token = 'HTRtGgyYrOgadJsQmHmYda19V4+zZ+UnxBYjCPdsE08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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