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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aecad45608d473cd1f1517dc6cbf5ed06f51fd647185b2f2be680d57ec5890fa' 
  AND token = 'mrbLoLz+jN04hjYwS1+RILsmclvEQFxUbzh2bI6RR2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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