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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24660e5c802f8e56104edb88a05f999b1b571eae4dd3a45c4ab525480c4d2eb0' 
  AND token = 'TaiQq2NVgWNXKaGwFYGK936Yg41Llyt0imsCW87UHDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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