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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a9eeb691b458d8c6538ad98992e7e2a2374ca7ab55509bc4cc37ae72195230' 
  AND token = 'kDoCxZfnE4Y4Go57Z7Z8MXfID9lWAov47dg+zYqIrSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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