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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3484653ff6e211373252269967e8ec0aaeaa528c765ec9c48b8a610d3b46eeb0' 
  AND token = 'e/DOJxc6tPrQHeo/5gyayR/XJ4+aHc3OAOdewTLHdi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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