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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ffb3b38630719b04249569ed6bc92f043d443143b21847cf5a5c420805bb4c6' 
  AND token = 'k+TDa1qWSt6BTrc43U7LB2vDOwbhRc11Ymv7mmVCk/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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