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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9c71aa8a35f2617e6f0bf4b1c15ecf1758e10302b5622e4d1f2480fcb72fd0' 
  AND token = '6jFpjiRnwEty/F9g6XAjvY/vqPBdG4Q/bRCyWfTpToI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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