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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4b5ee7e2f277a2436302a24fb1caa306eb07c1a01b96f7115bc3584ea68eb5' 
  AND token = '0BEA0zXFGDE6vSidZ03I6u6isDX9zRV2kxWveXw4DCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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