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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b9b0b68ab6ec6403f1d24a979bc80589e65bbf6b2cc25e64157b97bed46575' 
  AND token = '6NJU7ejdcldHmRht/ffXXD0pkWW9blFW/mq1/ZyuruU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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