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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad189a32e7f8d6d5da4fbc423389f91491272a62755792f19d7d50dbe1a02092' 
  AND token = '31nVOxv3HM5tLgY+7sqPf1oqyzhnicvvQSQ2PwK+fos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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