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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1393aee21e47f17ba93b1909f1be3844909fab7ad69da2fd0503748fcc2cfd8' 
  AND token = 'dotJRsrQnTpGMrcy1dTq3XEIiQryUsCN3udFQ13W/bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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