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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897602bc069b1094f7413b225bee185cc905157bfc985bf3d36635c509f57881' 
  AND token = 'qTqVinrO3J4Jx/NLMKKd5jEGjkI7O0PRNTcMGcf4xDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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