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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce541f534c361e13c3a382e114f28bc836c0f85626e6bdfbc90ab2eaac67cd8' 
  AND token = 'zk0z4+e0ZylnVdGduVmNbt5nuf93uJNPe0zGf7ARWdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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