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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8400f74b443fccffe523e6e989acf37ee765806600bbcd5e190b8fd411411d' 
  AND token = 'CQhf0lZDlDo6ZAgdVr10m9MLu9sy2XlKoZsPRpsv88c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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