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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26da2b6a1066671a47dbb72942ea50d4e78632aee8c5adfd893c431ba98383e9' 
  AND token = 'TdeM6wws2tDpa5U5P9ouq/TJ+eI0RtEbTmiAx+MZZzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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