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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b6ad771db3ba2b3e1a94da3505e2699ab78037af7d67e5c59718a8bdbcdac6' 
  AND token = 'Yzff//IAUnXYhqhqd8PYzdvmc2X3krT9lEShtSvL2Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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