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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8956fdca00b137402b51fcf590eb7f34c7e7211de45fd534d844416488215de0' 
  AND token = 'BbEWXevz8iFrIsgCztdqdbkEdLL9FIxta8uxtJupzXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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