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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25fe56ebed43bd829f9b2942968bb1c0877ac98f9f4d299b5ecdaf4d69a359e3' 
  AND token = 'Hxz2IvGxdSgpJ8AMah2/LNH5SqdrhQEbBwh4jszvkIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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