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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc5e7651fc763f6aca2b913ffffd2a7583a6be0ea9a9a49cd733fbef0b75835' 
  AND token = 'c3DxbQ1vHQBuj8QYlghDuX1jT9voDYjI4anu7PoWbns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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