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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24091a795afe8c59001da0ae98853d29dc11bdcce6c7814a8095d0e849488317' 
  AND token = '4XuBM19ih4j05qvjVt7HlAfKSceS1Z4Vb4hGWK6fefQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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