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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c9563bda11d2571442465e836d3ec52152460e5276a4bc964a1705adab13eb' 
  AND token = 'SOvo7+HM8xOAIdj3qHPx+S/6DZyA8X/fNrr2gcw0zyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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