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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432533b8491b3b3ad95e8b97a53dac280e984c2a6c12438b3f2b5f959c3d1713' 
  AND token = 'H086AWcTceIiqdcWobspy9DroeSBFBScDd/A5/PAvXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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