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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea75b6753e5981a9f61a9033c24eb816fed1943dab874575952e282a0966f96b' 
  AND token = 'ItSM/frp6f/RzWxpZX4MChnCt53Xfoe+xweUIsbazjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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