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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1af4eecd28a2be712942fccb066ce9b4a065b489090a855c6a8e1bb911cbb1' 
  AND token = 'iLlkLY62V8V0VI6D/0jY4zgIaMJrJCHgWNXDH0Dldko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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